package com.example.demo.interceptor;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

public class RedisSessionInterceptor implements HandlerInterceptor {
	   
//		@Autowired
//	    private RedisTemplate redisTemplate;
//	 
//	    @Override
//	    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
//	    {
//	        //无论访问的地址是不是正确的，都进行登录验证，登录成功后的访问再进行分发，404的访问自然会进入到错误控制器中
//	        HttpSession session = request.getSession();
//	        if (session.getAttribute("loginUserId") != null)
//	        {
//	            try
//	            {
//	                //验证当前请求的session是否是已登录的session
//	                String loginSessionId = (String) redisTemplate.opsForValue().get("loginUser:" + (long) session.getAttribute("loginUserId"));
//	                if (loginSessionId != null && loginSessionId.equals(session.getId()))
//	                {
//	                    return true;
//	                }
//	            }
//	            catch (Exception e)
//	            {
//	                e.printStackTrace();
//	            }
//	        }
//	 
//	        response401(response);
//	        return false;
//	    }
//	 
//	    private void response401(HttpServletResponse response)
//	    {
//	        response.setCharacterEncoding("UTF-8");
//	        response.setContentType("application/json; charset=utf-8");
//	 
//	        try
//	        {
//	            response.getWriter().print(JSON.toJSONString(new ReturnData(StatusCode.NEED_LOGIN, "", "用户未登录！")));
//	        }
//	        catch (IOException e)
//	        {
//	            e.printStackTrace();
//	        }
//	    }
//	 
//	    @Override
//	    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception
//	    {
//	 
//	    }
//	 
//	    @Override
//	    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception
//	    {
//	 
//	    }
}
